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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4f5d7f031f30a560aca2e8e2282ff7d8b276c75f0682fb17ba409b0f50fe10b' 
  AND token = 'FVOlp90RQPK033fyCj5KFwWduGP59qnUbJPHUDSazoQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}